Structure and function relationship of OqxB efflux pump from Klebsiella pneumoniae.

Structure and function relationship of OqxB efflux pump from Klebsiella pneumoniae.
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DOI:
10.1038/s41467-021-25679-0
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发表时间:
2021-09-13
影响因子:
16.6
通讯作者:
Murakami S
Murakami S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bharatham N;Bhowmik P;Aoki M;Okada U;Sharma S;Yamashita E;Shanbhag AP;Rajagopal S;Thomas T;Sarma M;Narjari R;Nagaraj S;Ramachandran V;Katagihallimath N;Datta S;Murakami S

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OqxB 是一种 RND(耐药-结瘤-分裂)外排泵,已成为导致肺炎克雷伯菌抗生素耐药性的一个因素。 OqxB 经历了水平基因转移,现在在其他革兰氏阴性细菌病原体中也可见到,包括大肠杆菌、阴沟肠杆菌和沙门氏菌,进一步传播了多重耐药性。在这项研究中,我们以 1.85 Å 的分辨率描述了 OqxB 的晶体结构,其中正十二烷基-β-D-麦芽糖苷 (DDM) 分子结合在其底物结合口袋中。我们在计算研究中利用这种结构来预测 OqxB 促进氟喹诺酮类药物流出的关键氨基酸,与相关转运蛋白 AcrB 和 MexB 中的类似残基不同。最后,我们对突变的 OqxB 进行的互补测定以及对大肠杆菌临床分离株的最低抑菌浓度 (MIC) 实验提供了进一步的证据,表明预测的结构特征确实与环丙沙星外流有关。 OqxB 是一种 RND(耐药-结瘤-分裂)转运蛋白,有助于肺炎克雷伯菌的抗生素耐药性。在这里,作者报告了 OqxB 的结构和功能表征,深入了解其底物结合袋和在氟喹诺酮耐药性中的作用。
OqxB is an RND (Resistance-Nodulation-Division) efflux pump that has emerged as a factor contributing to the antibiotic resistance in Klebsiella pneumoniae. OqxB underwent horizontal gene transfer and is now seen in other Gram-negative bacterial pathogens including Escherichia coli, Enterobacter cloacae and Salmonella spp., further disseminating multi-drug resistance. In this study, we describe crystal structure of OqxB with n-dodecyl-β-D-maltoside (DDM) molecules bound in its substrate-binding pocket, at 1.85 Å resolution. We utilize this structure in computational studies to predict the key amino acids contributing to the efflux of fluoroquinolones by OqxB, distinct from analogous residues in related transporters AcrB and MexB. Finally, our complementation assays with mutated OqxB and minimum inhibitory concentration (MIC) experiments with clinical isolates of E. coli provide further evidence that the predicted structural features are indeed involved in ciprofloxacin efflux. OqxB is an RND (Resistance-Nodulation-Division) transporter that contributes to the antibiotic resistance in Klebsiella pneumoniae. Here, the authors report structural and functional characterization of OqxB, with insights into its substrate binding pocket and the role in fluoroquinolone resistance.
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